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本工作以MoO_2Cl_2为主催化剂,(i-Bu)_2AlO为助催化剂,加氢汽油为溶剂,研究了该催化体系催化合成1,2—聚丁二烯的活性,并就聚合条件与单体转化率、聚合物的分子量、分子量分布及微观结构之间的关系进行了探讨。结果表明,MoO_2Cl_2以乙酸乙酯作增溶剂时,该催化体系具有较高的催化活性,在Mo/Bd=2×10~(-4)。50℃下聚合5小时,单体转化率可达95％以上,分子量在100万以上,分子量分布指数为2左右,1,2—链节含量在85％以上。
In this work, the activity of 1,2-polybutadiene catalyzed by this catalyst system was studied with MoO_2Cl_2 as main catalyst and (i-Bu) _2AlO as cocatalyst and hydrogenated gasoline as solvent, and the effects of polymerization conditions and monomer conversion Rate, the molecular weight of the polymer, molecular weight distribution and the relationship between the microstructure were discussed. The results show that the catalytic system has a high catalytic activity when MoO_2Cl_2 is treated with ethyl acetate as a solubilizer, with Mo / Bd = 2 × 10 ~ (-4). 50 ℃ polymerization for 5 hours, the monomer conversion rate of 95% or more, the molecular weight of more than 1 million, the molecular weight distribution index of about 2, 1,2-linked content of more than 85%.